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/*
* Interface for the 93C46/26/06 serial eeprom parts.
*
* Copyright (c) 1995 Daniel M. Eischen
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice immediately at the beginning of the file, without modification,
* this list of conditions, and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Absolutely no warranty of function or purpose is made by the author
* Daniel M. Eischen.
* 4. Modifications may be freely made to this file if the above conditions
* are met.
*
* $Id: 93cx6.c,v 1.4 1995/11/20 12:14:02 phk Exp $
*/
/*
* The instruction set of the 93C46/26/06 chips are as follows:
*
* Start OP
* Function Bit Code Address Data Description
* -------------------------------------------------------------------
* READ 1 10 A5 - A0 Reads data stored in memory,
* starting at specified address
* EWEN 1 00 11XXXX Write enable must preceed
* all programming modes
* ERASE 1 11 A5 - A0 Erase register A5A4A3A2A1A0
* WRITE 1 01 A5 - A0 D15 - D0 Writes register
* ERAL 1 00 10XXXX Erase all registers
* WRAL 1 00 01XXXX D15 - D0 Writes to all registers
* EWDS 1 00 00XXXX Disables all programming
* instructions
* *Note: A value of X for address is a don't care condition.
*
* The 93C46 has a four wire interface: clock, chip select, data in, and
* data out. In order to perform one of the above functions, you need
* to enable the chip select for a clock period (typically a minimum of
* 1 usec, with the clock high and low a minimum of 750 and 250 nsec
* respectively. While the chip select remains high, you can clock in
* the instructions (above) starting with the start bit, followed by the
* OP code, Address, and Data (if needed). For the READ instruction, the
* requested 16-bit register contents is read from the data out line but
* is preceded by an initial zero (leading 0, followed by 16-bits, MSB
* first). The clock cycling from low to high initiates the next data
* bit to be sent from the chip.
*
*/
#include <sys/param.h>
#include <sys/systm.h>
#if defined(__FreeBSD__)
#include <machine/clock.h>
#include <i386/scsi/93cx6.h>
#elif defined(__NetBSD__)
#include <machine/bus.h>
#include <dev/ic/smc93cx6var.h>
#endif
/*
* Right now, we only have to read the SEEPROM. But we make it easier to
* add other 93Cx6 functions.
*/
static struct seeprom_cmd {
unsigned char len;
unsigned char bits[3];
} seeprom_read = {3, {1, 1, 0}};
/*
* Wait for the SEERDY to go high; about 800 ns.
*/
#define CLOCK_PULSE(sd, rdy) \
while ((SEEPROM_INB(sd) & rdy) == 0) { \
; /* Do nothing */ \
}
/*
* Read the serial EEPROM and returns 1 if successful and 0 if
* not successful.
*/
int
read_seeprom(sd, buf, start_addr, count)
struct seeprom_descriptor *sd;
u_int16_t *buf;
#if defined(__FreeBSD__)
u_int start_addr;
int count;
#elif defined(__NetBSD__)
bus_io_size_t start_addr;
bus_io_size_t count;
#endif
{
int i = 0, k = 0;
u_int16_t v;
u_int8_t temp;
/*
* Read the requested registers of the seeprom. The loop
* will range from 0 to count-1.
*/
for (k = start_addr; k < count + start_addr; k++) {
/* Send chip select for one clock cycle. */
temp = sd->sd_MS ^ sd->sd_CS;
SEEPROM_OUTB(sd, temp ^ sd->sd_CK);
CLOCK_PULSE(sd, sd->sd_RDY);
/*
* Now we're ready to send the read command followed by the
* address of the 16-bit register we want to read.
*/
for (i = 0; i < seeprom_read.len; i++) {
if (seeprom_read.bits[i] != 0)
temp ^= sd->sd_DO;
SEEPROM_OUTB(sd, temp);
CLOCK_PULSE(sd, sd->sd_RDY);
SEEPROM_OUTB(sd, temp ^ sd->sd_CK);
CLOCK_PULSE(sd, sd->sd_RDY);
if (seeprom_read.bits[i] != 0)
temp ^= sd->sd_DO;
}
/* Send the 6 bit address (MSB first, LSB last). */
for (i = 5; i >= 0; i--) {
if ((k & (1 << i)) != 0)
temp ^= sd->sd_DO;
SEEPROM_OUTB(sd, temp);
CLOCK_PULSE(sd, sd->sd_RDY);
SEEPROM_OUTB(sd, temp ^ sd->sd_CK);
CLOCK_PULSE(sd, sd->sd_RDY);
if ((k & (1 << i)) != 0)
temp ^= sd->sd_DO;
}
/*
* Now read the 16 bit register. An initial 0 precedes the
* register contents which begins with bit 15 (MSB) and ends
* with bit 0 (LSB). The initial 0 will be shifted off the
* top of our word as we let the loop run from 0 to 16.
*/
v = 0;
for (i = 16; i >= 0; i--) {
SEEPROM_OUTB(sd, temp);
CLOCK_PULSE(sd, sd->sd_RDY);
v <<= 1;
if (SEEPROM_INB(sd) & sd->sd_DI)
v |= 1;
SEEPROM_OUTB(sd, temp ^ sd->sd_CK);
CLOCK_PULSE(sd, sd->sd_RDY);
}
buf[k - start_addr] = v;
/* Reset the chip select for the next command cycle. */
temp = sd->sd_MS;
SEEPROM_OUTB(sd, temp);
CLOCK_PULSE(sd, sd->sd_RDY);
SEEPROM_OUTB(sd, temp ^ sd->sd_CK);
CLOCK_PULSE(sd, sd->sd_RDY);
SEEPROM_OUTB(sd, temp);
CLOCK_PULSE(sd, sd->sd_RDY);
}
#if 0
printf ("Serial EEPROM:");
for (k = 0; k < count; k = k + 1) {
if (((k % 8) == 0) && (k != 0))
{
printf ("\n ");
}
printf (" 0x%x", buf[k]);
}
printf ("\n");
#endif
return (1);
}
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